Looking for opinions. Bought a used 2013 5.0 6 speed. Car is low as hell on H&R super sport springs. I have a vibration in floor and steering wheel side to side at 60-70 mph then it gets better around 75. I’ve made sure no retainer clips on rotors and have brand new tires and road forced balanced. Any ideas? Thinking about changing springs for just a 1” drop front and rear versus the 1.7” front and 2.4” rear on the supersports now seeing if that fixes it. Also on 19” amr wheels.